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Ages Eligible for Study:

18 Years and older (Adult, Senior)

Sexes Eligible for Study:

All

Accepts Healthy Volunteers:

No

Criteria

Inclusion Criteria:

A pacemaker indication for sinus node dysfunction and/or brady-tachy syndrome OR already implanted for less than three months for the mentioned reasons and supplied with a symphony 2550 DR at time of inclusion AND

A PR interval <250ms AND

Documented atrial arrhythmia in the past year

Medication for anti-arrhythmic must be stable for at least one month (2 months for amiodarone) prior to enrollment

Patients must have less than two known cardioversions within the last year

Patient has signed a consent form after having received the appropriate information

Exclusion Criteria:

Need a replacement pacemaker device

Have an unknown PR interval

Known AV block ≥ 250 ms PR interval

Minor and/or pregnant woman

Patients enrolled in other clinical trials

Patients with sustained ventricular arrhythmia

Patients with severe coronary artery disease (at the discretion of the investigator)

Patients with advanced cardiomyopathy (at the discretion of the investigator)

Patients who have sustained a myocardial infarction or undergone cardiac surgery within the past 30 days

Patients with unstable angina pectoris

Patients whose life expectancy is less than 1 year

Patients who are unlikely to return for required follow-up visits

Patients who present with permanent atrial arrhythmia or those who usually require cardioversion to terminate such arrhythmia and/or

Patients whose physician plans to add or change medical treatment because of AA episodes during the follow-up period.

Patient unable to understand the purpose of the study or refusing to cooperate

Contacts and Locations

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01170611